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Elena: You're bleeding.

Stefan: No, it's ok. It's ok. I'm ok.I couldn’t stop her.I tried. 

Elena: What does that mean?

Stefan: She fed, and then I lost her.

Elena: Oh, my god.

Stefan: I'll take care of it. I'll find her, and I will show her that she can live like I do. I will make sure that she does not hurt anybody, Elena.I promise you.